There is a good site offer a great tool to manage your Huawei Router . it is usually used to troubleshoot signal related such as RSSI etc . but the beauty of this tool is the following .
ability to change Freq yes . you can force your Huawei Router to which Operator Freq it can connect to . such as 800Mhz , 1800Mhz , 2600Mhz .
sometime operator Freq is congested ( loaded ) . so you could play around to find a good freq to connect to .
don’t forget also you could force LTE-A if you prefer .
this is really a great tool and I advise any Tech person to give it a shot ..
one note , for Huawei Router it has special image so make sure you download the right tool for Huawei router .